Insulation cutting device



July '7, 1942 J. J. BABIARY 2,288Q670 A Y INSULATION CUTTING DEVICE Filed Marc'zh 17; 1941 Jasepk Iaamp BY j ATTORNEYS Patented July 7, V1942 um.. "STAT- INSULATION cU'r'rmG DEVICE Josephj. Babiary, Yonkers, N. Y. Application March 17, 1941, Serial No. 383,847

(C1. sci- 91) 4 Claims.

' The present invention relates to new and useful improvements in devices for cutting the outer layers of cables and the like for removal thereof.

An object of the invention is to provide an insulation cutting'device of generally improved design. f

Another object of the invention is4 the provision of an insulation cutting device which may be quickly and easily mounted in operative position on a cable. Y

A further object of the invention is to provide a cutting device of the aforesaid character constructed sothat the cutter maybe adjusted to very accurately regulate the depth of the out.

Still another object of the invention is the provision of a cutting device of vthe above character which is adapted to accommodate cables of greatly varying size.

A .still further object of the invention is the provision of an insulation lcutting device which will enable cutting of the outer layer of a cable without damaging the interiorl thereof.

Another object of the invention is the provision of an insulation cutting device which may .be readily positioned in accurately mounted cutting relation with a cable.

A further object of the invention is to provide a cutting device of the above character which is Arelatively .simple and durable in construction and efficient in use.

Other objects and advantages of the invention will become apparent as the description progresses.

In the accompanying drawing forming a part of this specification and in which like numerals are employed to designate corresponding parts throughoum' f Figure 1 is a plan view of the device, partly in section, operatively associated with a cable,

Figure 2 is a fragmentary sectional view taken on line 2-2 of Figure 1,

Figure 3 is a fragmentary perspective view of an adjusting structure of the device, and

Figure '4 is a fragmentary plan view illustrating a different adjustment of the cutter from that shown at Figure 1.

Referring in detail to the drawing, wherein for the purpose of illustration is showna preferred example of the invention, I generallyv designates the body of the `device which is in the form of an approximately tubular casing having a` rectangular exterior contour and aA cylindrical bore Il. This body casing is preferably composed of apair of complementary sections divided axially with interftting apertured knuckles I2 designed to accommodate therethrough pivot bolts I3. Either of the two pivots I3, which threadedly connect with the knuckle joints, is removable to enable hinged opening of the body.

Formed integral with the body and projecting radially therefrom with respect to the axis of .the bore II, from three of the outer side faces,

are tubular guide` arms I4 of rectangular cross section and open at the ends. The inner end of each guide I4 is in registration with a rectangular passage I5 in the side of the body corresponding to the bore of the guide. At its outer portion each o f these guides is formed with an opening I6 ina side wall thereof for a purpose which will be later described. These three guide members may be of uniformlsize, one pair being in alignment while the intermediate guide aligns with a somewhat longer tubular guide I1, otherwise similar to the guides I4. At their outer ends each of' these tubular guides is shaped to provide a pair of opposed outwardly directed ribs I8 formed on opposed side walls thereof, while the wall opposed to that having the opening I6 is prolonged at its outer end to provide a stop lip I9.

On the outer end of each guide is removably fitted an end cap 20 formed with a central in?.

teriorly threaded reinforced aperture and having the end portions bent to provide channel portions 2| slidably engageable with the ribs I8.

` When in assembly on the guide one side edge of the cap 2D abuts the lip I9 to properly position the cap. Extended 'through the threaded aperture in each end cap 20 is a screw 22 formed on its outer end with an enlarged head 23 having a transverse bore slidably accommodating a transversely arranged turning pin 24.

Within yeach of the three guides I4 is fitted a slide member v25 in the formI of a hollow bar of rectangular cross section having non-rotary slidable connection with the guide and closed at the outer end, as indicated at 26.. The inner end' of each of these slide bars is shaped to form a bifurcated extension 21 supporting a transversely mounted pin 28 carrying a roller 29 designed to project inwardly beyond the end of the bar. In

at obliquely opposed comers which are formed the longer guide I 'l is slidably fitted a rigid sleeve 30 of rectangular cross section provided in one side with a longitudinal slot 3|. This sleeve as well as the hollow bars 25 of the remaining guides I4 may be fixed in adjusted position by means of set screws 32 threadedly extended through side walls of the guides and engageable with the slide elements. Thefsleeve 30 is designed to slidably accommodate therein a cutter bar 33 beveled at y one end to form a blade 3l preferably V-shaped in one plane and obliquely beveled in a perpendicular plane to form an inclined cutting edge 35 is clearly shown at Figures l and 4. .The bar 33 is preferably provided with a plurality of interiorly threaded transverse bores 36 adapted to engage a screw 31 for tightly fastening the cutter to the sleeve 30. As shown to advantage at Figure 1 the inner end portion of this sleeve is contracted .so that it has a diminishing taper in approximately correspondence -with the beveled -faces of the blade, the inner end edge being disposed about and in close proximity to the cutting edge to provide an abutment adjacent the cutting edge DOrtion .when the latter is in protruding position.

To employ the device for making a longitudinal in cision in the exterior insulation or outer insulative layer of 'a cable the parts are assembled a's shown at Figure l, one of the pivot bolts I3 being removed to enable the body to the arrangedvin encircling position about the cable and thereafter replaced to firmly. lock the sections thereof. The roller carrying slides 25 are disposed in the guides I4 in suchv manner that the axes of the rollers 29 will be perpendicular to the ax'is'of the cable, the bars being adjusted inward against three spaced sides of the cable by rotation of the screw bolts 23 which thrust the same toward the axis of the casing. When these roller supports are properly adjusted the sleeve `30'is also thrust against the surface. of the cable in diametric opposition to one of the rollersso .that the outer edge of the sleeve rmly abuts the cable insulation, rigidly tting the casing .in approximately concentric position about-the cable. The cutter bar 33 is then adjusted with relation to the sleeve 30, to project the cutting edge 35 into the insulation covering for a distance suili-v cient to penetrate the thickness of the outer insulation layer.

length in the insulation covering thereof.

At the end of the longitudinal incision the insulation covering is cut-circumferentially by extracting theslide bars 25 from their respective guides and reinserting the same therein in positions turned at right angles to their former mounting, so that the axes of the rollers 29 will assume positions parallel with the axis of the cable, as best shown in Figure 4. The sleeve 3!) vand" cutter bar 33 mounted therein are also or wires or -the inferior insulation covering the same. In order -to enable turninghof 'the slides 25 and the sleeve 30 to right angular positions about their axes, within the guides, these members are preferably square or of similar uniform contour. The opening I6 in the outer side portion of each guide enables removal of the screw 22 by lateral sliding movement with the cap 2i) without the necessity of turning the screw to effect outward axial movement to its full lensth The device is then drawn longi'- 'tudinally along the cable to cut a slit of desired and thereby expediting the operation of changing the setting ofthe device for longitudinal vand annular cutting.

As will be apparent from the foregoing my improved device provides means for cutting insulating covering of various materials, such as fabric and lead, from the coreof a cable or like article and is applicable to cables of varying sizes the covering or sheath.

It is to be understood that the form of my invention herewith shown and` described is' to be taken .as a preferred example of the same and that various changes relative to the material, size, shapeand arrangement of parts may be resorted to without departing from the spirit of the invention or the 'scope of the subjoined claims.

Having thus described my invention, I claim: l. In a device of the character described, a body formed to encircle a linear object, a pluralityof support elements adjustably carried by the said body adapted to engage the said linear .object at circumferentially spaced points, one

of the said support elements being hollow, and a cutter -adjustably mounted in the said hollow support adapted to provide a cutting edge which may be disposed to penetrate the outer portion of the said linear object for forming an incision therein.

2. In a device for cutting' the outer 'layer of cables and the like, a tubiform body, a plurality of radial guides on the said body, a plurality of support elements slidable radially of the body in the said guides, the inner ends of the said support elements being adapted to engage a cable at equidistant circumferentially spaced points, one

of the said guides constituting a sleeve having f its innerv cable contacting end open, the remainder of the said support elements having cable contactingrollers at their inner ends, and a cutting element slidably mounted inthe sleeve 'support so that its inner cutting end may be projected beyond the end of the sleeve toV cut an incision of selected depth in the cable.

3. In a device for cutting the outer layer of cables and the like, a tubiform body, a plurality of radial guides on the said body, a plurality of support elements'slidably mounted in the said guides, the inner ends of the said support elel ments being adapted'to engage a cable at equiinner cable contacting end open, the remainder of the said support elements having cable contacting rollers at their inner ends, a cutting /element slidably mounted in the sleeve support having its inner cutting end protrusible beyond the l end of the sleeve to cut an incision of selected depth in the cable, the said support elements being angularly adjustable in the guides, and means for releasably fastening the supports in adjusted position whereby to permit cutting of the cable circumferentially as well nally. 4. In an insulation cutting device an, approximately annular body, means on the said body for engaging a cable extended therethrough at circumferentially spaced points to hold the body in approximately concentric arrangement about the cable, one of the said means including a member on the body disposed to provide a radial passage through and outwardly of the body, a. sleeve slidably fitted in the said passage and lonas longitudi.-

2,288,670 n l l 3 'gitudnallv adjustable therein, the inne'r end of v of the sleeve, means `for releasably fastening the the said sleeve being adapted for engagement cutter member in longitudinally adjusted posiwith the exterior of a. cable extended through tionin the sleeve, and means for releasably fasthe body; a cutter member extending through the tening the sleevein longitudinally adjusted posipassage and through the said sleeve therein, the 5 tion in the radial passage.

said cutter having a cutting blade at its inner end adapted to project from the inner open end JOSEPH J. BABIARY. 

